recently got a blowjob from a girl who had large amounts of sharp teeth that she raked up and down on my penis as I debated stopping her or not. Checked my skin for puncture wounds later and was relieved not to find any real damage but I was sore for a couple days.
the worst experience was going down to Vancouver for New Years and getting a nice hotel room so I could take my ex-girlfriend out on the town and then back to the hotel. Once we get back to the hotel she decides it wouldn't be right for us to have sex so she calls a cab and goes home. I then got to listen to the people in the next room having sex.
note we'd split because she moved by the way, and we planned this night. Oh well..